2nd grade Instructional Guide

Number and Operations in Base Ten

Core Guide

Grade 2

Understand place value (Standards 2.NBT.1–4) Standard 2.NBT.4 Compare two three-digit numbers based on meanings of the hundreds, tens, and ones digits, using >, =, and < symbols to record the results of comparisons. Concepts and Skills to Master • Understand that when comparing two numbers, one looks at the whole number, not just individual digits • Understand that a number (greater than 0) in the hundreds place always has a greater value than the number in the tens place • Generalize that the number with the most hundreds is greater • Understand that if the number of hundreds is the same, the number with more tens is greater; if the number of hundreds and tens is the same, the number with more ones is greater • Use terms including greater than, more than, less than, fewer than, equal to, and same as, to describe comparisons • Use the symbols >, =, and < to correctly to compare three-digit numbers • Understand that two three-digit numbers that have equal value are represented by the = sign Teacher Note: In kindergarten students use verbal language to identify whether groups of objects or numerals are greater than, less than or equal to other groups of objects or numerals. In first grade students are introduced to using the symbols to record comparisons. Emphasis should be placed on the meaning of quantities rather than tricks such as “the alligator eats the bigger number,” etc. In second grade, students should become more comfortable with the use and meanings of these symbols.

Related Standards: Current Grade Level

Related Standards: Future Grade Levels

2.NBT.1 Understand that the three digits of a three-digit number represent amounts of hundreds, tens, and ones 2.NBT.3 Read and write numbers to 1,000 using base-ten numerals, number names and expanded form

3.NF.3 Compare two fractions with the same numerator or the same denominator. Record the results of comparisons with the symbols >, +, or < 4.NBT.2 Compare two multi-digit whole numbers based on meaning of the digits in each place, using >, =, and < symbols 4.NF.2 Compare two fractions with different numerators, and different denominators. Record the results of comparisons with symbols >, =, or <

Critical Background Knowledge from Previous Grade Levels • Understand that the two digits of a two-digit number represent amounts of tens and ones. (1.NBT.2)

• Compare two numbers between 1 and 10 presented as written numerals using “great than,” “less than,” or “equal to.” (K.CC.7) • Identify whether the number of objects in one group is greater than, less than or equal to the number of objects in another group. (K.CC.6) • Compose and decompose numbers from 11-19 into ten ones and some further ones (K.NBT.1) Academic Vocabulary compare, more, greater than (>), more than, most, less, less than (<), fewer, least, equal (=), same as Suggested Models Suggested Strategies

• Use concrete materials such as objects on a place value chart, a 100 chart, base-ten blocks, and number lines to compare two three-digit numbers • Write two three-digit numbers in expanded form and compare the value of the hundreds, tens, and ones

452 > 438 438 < 452

2.NBT.4

ADA Compliant 1/13/2020